Opera is trying to play .mov movies with gxine which then claims it cannot findthe demuxer and stream format not recognised. Totem and vlc will play this format.mov, however, Opera does not give the option to play with either of them.

I am not able to tweak Opera so it will play .mov with either totem or vlc.

Thanks! I had a hard time. Opera would not take/register even as sudo, add or edit, and would keep on opening a page showing the downloaded .mov file in its entirety. Only when I editeddirectly operaprefs.ini could I finally tweak it to now open with vlc.